Azole rings are present as (among other properties) insect defense properties in many plants, with cereals kind-of specialized in hydroxamic azaleas (Dimboa and family), and some legumes as isoxazole accumulators (isoxazolinones mostly).
See some refs on these two pathways, but there are plenty of. Maybe you could find diazos in such families, or restricted genuses within poacea and papilionoidae ?
Hope this helps
Yvan
[16411] Blassioli Moraes, M. C. B., M. A. Birkett, R. Gordon-Weeks, L. E. Smart, J. L. Martin, B. J. Pye, R. Bromilow, and J. A. Pickett. 2008. cis-Jasmone induces accumulation of defence compounds in wheat, Triticum aestivum. Phytochemistry 69: 9-17.
[7703] Kuo, Y. H., F. Ikegami, and F. Lambein. 1998. Metabolic routes of beta-(isoxazolin-5-on-2-yl)-L-alanine (BIA), the precursor of the neurotoxin ODAP (beta-N-oxalyl-L-alpha,beta,-diaminopropionic acid), in different legume seedlings. Phytochemistry 49: 43-48.
[1393] Kuo, Y. H., F. Lambein, F. Ikegami, and R. Van Parijs. 1982. Isoxazolin-5-ones and amino acids in root exudates of pea and sweet pea seedlings. Plant Physiol. 70: 1283-1289.
Klun, J. A., and T. A. Brindley. 1966. Role of 6-methoxybenzoxazolinone in inbred resistance of host plant (maize) to first-brood larvae of european corn borer. J. Econ. Entomol. 59: 711-718.
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